body {
    font-family: Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
}

.container {
    width: 80%;
    margin: auto;
    overflow: hidden;
    padding: 20px;
}

header {
    background: #333;
    color: #fff;
    padding: 1rem;
    text-align: center;
}

nav {
    background: #444;
    padding: 0.5rem;
}

nav button {
    background: #666;
    color: #fff;
    border: none;
    padding: 10px 15px;
    margin-right: 10px;
    cursor: pointer;
}

nav button:hover {
    background: #777;
}

.management-section {
    background: #fff;
    margin: 15px 0;
    padding: 20px;
    border-radius: 5px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
}

table, th, td {
    border: 1px solid #ddd;
}

th, td {
    text-align: left;
    padding: 12px;
}

th {
    background-color: #f2f2f2;
}

button {
    background: #333;
    color: #fff;
    border: none;
    padding: 10px 15px;
    margin-top: 10px;
    cursor: pointer;
}

button:hover {
    background: #444;
}